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SAS/INSIGHT User's Guide |

*Box plots* are pictorial representations
of the distribution of values of a variable.
The central line in each box marks the median value and
the edges of the box mark the first and third quartiles.
The *median* value of a distribution is the
50th *percentile*: It is the value
less than and greater than 50% of the data.
The first and third *quartiles* are
the 25th and 75th percentiles.
By combining these three values in a schematic diagram and
plotting individual markers for extreme data values, the box
plot provides a concise display of a distribution (Tukey 1977).
*Mosaic plots* are pictorial representations
of frequency counts of a single nominal variable
or cross-classified nominal variables.
Because mosaic plots display the frequencies graphically,
they are easier to understand than crosstabulations.
You can select and brush mosaic plots to
explore dependencies between variables.

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